Control of pure yellow aphid wasp of brown scale in orange orchard

[morphological characteristics]

The female cicada is 0.92-1.18 mm long, yellow and spotless. The posterior edge of the scutellum has dark brown stripes. There are short black stripes at the base of the forewing, dark brown on the ventral side of the antennal stalk, and dark smoke on the rest of the segments. Yellow feet. Compound eyes have fine hairs. The chest hair is thick and black, there are 4 hairs on the scutellum, the length of the forewing is 2.25 times of the width, and the spawning needle is 1.9-2.01 times the length of the tibia of the middle foot. The length of the male wasp is 0.71-0.92 mm, and the forewing is 2.2-2.33 times longer than that of the female. The important difference from the golden aphid wasp is that the pure yellow aphid wasp is hermaphroditic, and the sternoventral segment is shorter, which is 0.75-0.8 times longer than that of the small shield. Fan-shaped protruding, elongated. Strongly overlapping, the chest and ventral surface of the mature pupa are dark brown, and only the ventral end is lighter. The golden aphid wasp is a unisexual species, the male is rare in nature, and the thoracoabdominal segment is longer, which is as long as or slightly longer than the scutellum. The trailing edge is broad-arched, fan-shaped, small, round and non-overlapping. The mature pupa is yellow, with only a black vertical line on the middle chest and web.

[occurrence regularity]

The pure yellow aphid wasp of brown round scale is a more specific parasitoid of brown round scale, which generally does not parasitize on the red circle scale.

[protection and utilization]

The main results are as follows: (1) the brown round scale was cultured with pumpkin and oleander leaves to breed aphid wasps. During the full incubation period of scale insects, the branches and leaves of scale insects were placed on the above plants, and the hatched mosquitoes climbed up and were fixed and parasitized, and when the scale insects were second instar, they could be inoculated with aphid wasps. Parasitized worms can be cooled and stored and released to the orchard when needed.

(2) in early spring, the branches and leaves with parasitic shield steps of aphids were cut and moved into the parasitoid protector in the orchard to let the parasitic wasps Eclosion, and then parasitized the shell insects.

(3) the scutellum branches parasitized by aphid wasps were cut in winter and refrigerated. Before a large number of scale insects occurred in the following year, the branches were taken out and hung in the orchard.

(4) pesticides with broad spectrum and long residual period should not be used. Especially in the peak period of adult activity, the application of pesticides should be stopped.